91212e0aa0
In preparation for turning this into a common loader for 32-bit and 64-bit platforms, ensure the code will compile cleanly for either. Signed-off-by: Leif Lindholm <leif.lindholm@linaro.org>
163 lines
3.6 KiB
C
163 lines
3.6 KiB
C
/*
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* GRUB -- GRand Unified Bootloader
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* Copyright (C) 2013-2015 Free Software Foundation, Inc.
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*
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* GRUB is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* GRUB is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with GRUB. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <grub/fdt.h>
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#include <grub/mm.h>
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#include <grub/err.h>
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#include <grub/dl.h>
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#include <grub/command.h>
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#include <grub/file.h>
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#include <grub/efi/efi.h>
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#include <grub/efi/fdtload.h>
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static void *loaded_fdt;
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static void *fdt;
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void *
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grub_fdt_load (grub_size_t additional_size)
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{
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void *raw_fdt;
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unsigned int size;
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if (fdt)
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{
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size = GRUB_EFI_BYTES_TO_PAGES (grub_fdt_get_totalsize (fdt));
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grub_efi_free_pages ((grub_addr_t) fdt, size);
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}
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if (loaded_fdt)
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raw_fdt = loaded_fdt;
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else
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raw_fdt = grub_efi_get_firmware_fdt();
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size =
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raw_fdt ? grub_fdt_get_totalsize (raw_fdt) : GRUB_FDT_EMPTY_TREE_SZ;
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size += additional_size;
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grub_dprintf ("linux", "allocating %d bytes for fdt\n", size);
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fdt = grub_efi_allocate_any_pages (GRUB_EFI_BYTES_TO_PAGES (size));
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if (!fdt)
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return NULL;
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if (raw_fdt)
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{
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grub_memmove (fdt, raw_fdt, size);
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grub_fdt_set_totalsize (fdt, size);
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}
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else
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{
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grub_fdt_create_empty_tree (fdt, size);
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}
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return fdt;
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}
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grub_err_t
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grub_fdt_install (void)
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{
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grub_efi_boot_services_t *b;
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grub_efi_guid_t fdt_guid = GRUB_EFI_DEVICE_TREE_GUID;
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grub_efi_status_t status;
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b = grub_efi_system_table->boot_services;
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status = b->install_configuration_table (&fdt_guid, fdt);
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if (status != GRUB_EFI_SUCCESS)
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return grub_error (GRUB_ERR_IO, "failed to install FDT");
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grub_dprintf ("fdt", "Installed/updated FDT configuration table @ %p\n",
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fdt);
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return GRUB_ERR_NONE;
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}
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void
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grub_fdt_unload (void) {
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if (!fdt) {
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return;
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}
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grub_efi_free_pages ((grub_addr_t) fdt,
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GRUB_EFI_BYTES_TO_PAGES (grub_fdt_get_totalsize (fdt)));
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fdt = NULL;
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}
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static grub_err_t
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grub_cmd_devicetree (grub_command_t cmd __attribute__ ((unused)),
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int argc, char *argv[])
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{
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grub_file_t dtb;
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void *blob = NULL;
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int size;
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if (loaded_fdt)
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grub_free (loaded_fdt);
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loaded_fdt = NULL;
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/* No arguments means "use firmware FDT". */
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if (argc == 0)
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{
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return GRUB_ERR_NONE;
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}
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dtb = grub_file_open (argv[0]);
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if (!dtb)
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goto out;
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size = grub_file_size (dtb);
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blob = grub_malloc (size);
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if (!blob)
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goto out;
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if (grub_file_read (dtb, blob, size) < size)
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{
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if (!grub_errno)
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grub_error (GRUB_ERR_BAD_OS, N_("premature end of file %s"), argv[0]);
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goto out;
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}
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if (grub_fdt_check_header (blob, size) != 0)
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{
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grub_error (GRUB_ERR_BAD_OS, N_("invalid device tree"));
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goto out;
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}
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out:
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if (dtb)
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grub_file_close (dtb);
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if (blob)
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{
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if (grub_errno == GRUB_ERR_NONE)
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loaded_fdt = blob;
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else
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grub_free (blob);
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}
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return grub_errno;
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}
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static grub_command_t cmd_devicetree;
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GRUB_MOD_INIT (fdt)
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{
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cmd_devicetree =
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grub_register_command ("devicetree", grub_cmd_devicetree, 0,
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N_("Load DTB file."));
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}
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GRUB_MOD_FINI (fdt)
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{
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grub_unregister_command (cmd_devicetree);
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}
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